Crank-pin-turning attachment for lathes.



No. 000,978.. Patented 0er. 3.0, |900.

A. TINDEL 0 0. ALBnEcnT. CBANK PIN TURNING ATTACHMENT FOB LATHES.

(No Mode-IJ` (Applicatioh filed Jan. 8. 1900A Tiss,

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No. 660,978. v Patented 0st. 30, |900.

A. TINDEL &. 0. ALBRECHT CBANK PIN TURNING ATTACHMENT FOB LATHES.

(Applicatinu led Jsm, 1900.1

3 Sheets-Sheet 2.

(No Model.)

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N0. 660,978. Patented 00L 30,v |900.

A. TINDEL -& D. ALBRECHT. CBANK PIN'TURNING ATTACHMENT FOB LATHES.

(Applicatinn filed Ian. 8, 1900.\ (No Model.) 3 Sheets-Sheet 3.

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UNITED' -`STATES 1 PATENTv Ormes..

ADAM TINDEL AND OTTO ALBROHT, OF PHILADELPHIA, PENNSYLVANIA.

CRANK-PIN-TUNING ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 660,978, dated OctoberV30, 1900.

' Application filed January 8, 1900. Serial No. '739. (No model.)

To all whom it may concern:

Beit known that we,ADAM TINDEL and O'rro ALBRECHT, citizens of theUnited States, and residents of Philadelphia, Pennsylvania, haveinvented certain Improvements in Crank-Pin- Turning Attachments forLathes, of which the following is a specification.

The object of our invention is to provide means whereby an ordinaryturning-lathe may be readily adapted for turning crankpins oreccentrics-an object which we attain in the manner hereinafter setforth, reference being had to the accompanying drawings, in which-Figure 1 is a side view, partly in section, of the parts comprising ourinvention. Fig.l 2 is a top or plan view of the same. Fig. 3 is asection on the line a d, Fig. 2; and Fig. 4 is a side view illustratinga special feature of our invention.

As represented in Fig. 1, the attachment comprises two face-plates l and2, the faceplate 1 being intended for application to the lathe-mandrelin place of the ordinary faceplate and being provided with a spur-gear3, whereby it may be rotated by the gearing of the lathe. The face-plate2 is mounted so asl to be free to turn upon a sleeve 4, which is mountedso as to 'be incapable of turning upon the tail-stock or dead-spindle 5of the lathe, a clasp-ring 6 being secured to said sleeve and engagingwith a groove in the hub of the face-plate 2, so as to retain the latterin position longitudinally. Each of the faceplates carries a set ofcrank-shaft chuckingA and gripping devices, and as these devices are thesame on each face-plate a description of one set will suffice. Theface-plate has dovetailed grooves 7 and 8 crossing each other at rightangles, the groove 7 serving as a guide for the shaft-chucking deviceand the groove 8 serving as a guide for a pair of crank-arm-clampingjaws.

The chucking device comprises a slide 9, having a dovetailed rib forengagement with the dovetailed groove 7, and also having a nut 10 forengagement with an adjustingscrew 11, which is conned longitudinally toa suitable stud on the face-plate, so that by turning said screw thechuck-slide can be caused to move toward or from the center of theface-plate.

manipulating nuts 15. on said bolts'the chuckjaws can .be caused tosecurely clamp the crankshaft, as shown by dotted lines in Figs. 2 and3, the radial position of the chuck-slide 9 on'the face-plate beingdependent upon the throw of the crank, it being understood that theaxial line of the crank-pin is coincident with the axis of theface-plate.

The groove 8 of the face-plate receives dovetailed ribs upon a pair ofslides 16, each of which has a projecting arm 17, forming a clamp-jawfor engagement with an arm of the crank, the slides being caused toIapproach and recede from the axis of the face-plate by means of ascrew-stem 1S, which is longitudinally confined to a stud 19 on theface-plaie,

.and has a right-hand threaded portion for engagement with a lnut 20 onone of the slides 16 and a left-hand threaded portion for engagementwith a similar nut on the other slide 16.

The outer ends of the arms 17 have openings ior the reception of atransverse bolt 21, which is provided with a nut 22. Hence when theslides 16 have been adjusted to such positions as to cause theclamp-jaws at the outer ends of the arms 17 to bear upon the arms of thecrank, as shown in Figs. 1 and 2, said jaws may be caused to firmly gripthe crank-arms by tightening the nuts 22, a much firmer hold upon thecrank-arm being thus insured than if reliance were placed wholly uponthe inward movement of the slides 16 under the action of the'screw-stem18 for effecting this result.

The construction described provides a simple and convenientattachmentwhereby an ordinary turning-lathe can be readily adapted forthe turning of crank-pins.

If desired, the chuck-slide 9 may be provided with a center pin 23, asshown in Fig. 4, and the chuck may be adjusted so as to serve as acenterchuck for the lathe.

We have shown the device as applied to a shaft having a single crank;but it Will be evident that it can be applied as well to shafts having aseries of cranks.

ICO

Having thus described our invention, we claim and desire to secure byLetters Patent- 1. The combination of a lathe cross-head with means forchucking a crank-shaft, and a pair of' adjustable slides each having,r aprojectincr arm forming' a clam p-jaw for engaging; with a cran k-arm ofsaid shaft, substantially as specified.

2. The combination of a lathe face-plate with a radialiy-adjustablechucking device for a crank-shaft, and a pair of adjustable slides eachhaving a projecting arm forming a clamp-jaw for engaging with acrank-arm of said shaft, substantially as specified.

3. The combination of a lathe face-plate with means for chuckingr acrank-shaft, a pair of adjustable slides each having a projecting armforming a clamp-jaw for engaging With a crank-arm of said shaft, and aclampingbolt whereby the outer ends of said arms may be drawn together,substantially as specied.

4. rlhe combination in a crank-pint.urnin gr attachment for lathes, of apositively-rotated facefplate and a face-plate mounted so as t0 be freeto turn on the tail-stock, or dead-spindle of the lathe, withshaft-chncking mechanism, and pairs of adjustable crank-armgrippingjaws, one pair on each of said faceplates, substantially as specified.

In testimony whereof We have signed our names to this specification inthe presence of two subscribing witnesses.

ADAM TINDEL. OTTO ALBRECH'I.

\Viti11esses:

FRANK E. BEcHToLD, J os. H. KLEIN.

